mm: introduce node_zonelist() for accessing the zonelist for a GFP mask

Introduce a node_zonelist() helper function.  It is used to lookup the
appropriate zonelist given a node and a GFP mask.  The patch on its own is a
cleanup but it helps clarify parts of the two-zonelist-per-node patchset.  If
necessary, it can be merged with the next patch in this set without problems.

Reviewed-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
index 59c4865bc85f..69160dc32d48 100644
--- a/include/linux/mempolicy.h
+++ b/include/linux/mempolicy.h
@@ -241,7 +241,7 @@ static inline void mpol_fix_fork_child_flag(struct task_struct *p)
 static inline struct zonelist *huge_zonelist(struct vm_area_struct *vma,
                 unsigned long addr, gfp_t gfp_flags, struct mempolicy **mpol)
 {
-        return NODE_DATA(0)->node_zonelists + gfp_zone(gfp_flags);
+        return node_zonelist(0, gfp_flags);
 }
 
 static inline int do_migrate_pages(struct mm_struct *mm,